Reenforced concrete structure



May 11 192.6.

H. T. COATES REENFORCED CONCRETE STRUCTURE Filed June 19, 1920 2 Sheetssheet 1 May 1l 1926. 1,584,216

' H. T. coATEs REENFORCED CONCRETE STRUGTUR E Filed June 19. 1920 2 Sheets-sheet 2 Patented May ll, 1925o HENRY 'l'. COATES, OF GERMANTOVN, PENNSYLVANIA.

BEENFORCED CONCRETE STRUCTRE.

Application led June 19, 1920.

rlhis invention relates to reenforced concrete structures.

The object of the invention is to provide a reenforced concrete structure which is simple, efficient, and economical to build.

A further object is to provide a chair device for supporting the reenforcing rods einployed in reenforced concrete `structures, which is simple, efficient, economical to construct and to apply, and wherein the reenforced rods are maintained in propei' position Within the body of the concretestructure.

Other objects of the invention Will appear more fully hereinafter.

The invention consists substantially in the construction, combination, location and arrangement, all as will be more fully hereinafter set forth, as shown in the accompanying drawings, and finally pointed out in the appended claims.

Referring to the accompanying dravvings,

Fig. 1 is a view in perspective, showing a portion of a form, a reenforcing` rod and chairs for supporting the latter, in accordance with my invention, these parts being assembled ready to receive the concrete.

Fig. 2 is a View similar to Fig. l showing a slightly different type of reenforcing rod.

Fig. 3 is a View showing another type of reenforcing rod and the application of concrete.

Fig. l is a view in section on the line 4l, Ll, Fig. 3. l

Fig. -is a top plan view of a reenforcing rod supporting` chair embodying my invention.

Fig. 6 is a vieu7 in perspective of a slightly modified form of chair embodying the principles ofmy invention. Fig. 7 is a top plan' view of the same.

Fig. 8 is view in side elevation partly broken away showing another form of chair embodyino' my invention.

Fig. 9 is a transverse section of the same in the line 9, 9, Fig. 8.

Fig. l0 is avieiv similar to Fig. 8 showing still another form of chair embodying the principles of my invention.

Fig. 1l is an end view of the forni of chair shown in Fig. 10.

. A.li`ii ,.,i2. is, e breken view iiiioeiseeeive ef Serial No. 390,066.

intersecting reenforcing rods and a chair for one of them.

The same part is designated by the saine reference numeral Wherever it occurs throughout the several views.

ln the erection of reenforced concrete structures it is a common practice to build up with planlring suitable forms to the required shape, such as pillars, Walls, floors, and the. like, and then place suitable steel reenforcements Within the` forms and finally to pour into or lill the forms with concrete so as to surround the reenforcing meinbers. ln order to secure the best results the reenforcing members should be efficiently held in place Within the forms and While the concreate is being poured. 'For this purpose wire devices or cradles have been employed, these devices being suitably nailed to the forms and the reenforcing rods being placed thereon. These Wire cradles, hou'- ever, have not been satisfactory for the reason that they are more or less fragile or resilient and bend under the .veight of the rods, thereby displacing` the rods, and, moreover, it takes time and labor to nail them with suflicient secureness to the form, to prevent them from bending, and when they become bent or deflected, it is a difficult job requiring time and labor to reposition them or the rods which their bending has caused to become deranged.

Again, it is'desirable to maintain the reenforcing members a substantially fixed distance from the outer surface of the concrete body, and in case a fragile chair or support forthe reenforcing member is employed, its collapse or deforamation when the Weight of the reenforcing member is imposed there-- on, Will peiniitthe reenforcing member to become displaced and to approach the outer surface of the concrete body, and hence if the concrete body should be subjected to heat, as when a fire occurs in a building in which suoli reenforced body is employed, the danger is incurred of the reenforcing membei being melted by the heat, thereby destroying its reenforcing function and hence weakening the entire body.

lt is among the special objects of my piesent invention to provide a supporting chair @was for the reqnfercinerede @if @secrete structures which avoids the objections above noted, and others, which is simple in structure, economical to manufacture, and can be easily and readily applied in position for use, and Which not only cannot bend under the Weight of the reenforcing` rod imposed thereon, but Which materially adds to the strength of thereenforced structure, and which is capable of maintaining the reenforcing member at the required distance from the outer surface of the concrete body.

In carrying,` out my invention I provide a chair upon Which the reenforcingj rod or bar is positioned, and which not only offsets the rod or bar from the form so as to permit the same to he completely surrounded by and imbedded in the concrete, but Which'holds or retains such rod or bar in place. In accordance with one embodiment of my invention l form the chairs by stamping the same out` of sheet steel, and pressing or stampingy them into substantially channel or V-shape in cross section, and in order to form retaining' and holding` seats for the reenforc iup,` rods or bars I form notchesor depressions in the outer edges of theflaring or inclined side Walls of the chairs, into which the rods, which are disposed in transverse Vrelation with respect to the chairs, are received. This arrangement provides a support for the reenforcing member at tivo separated points on each chair.

In the drawing` the chairs are indicated, generally, by reference numeral 15. These, in the particular form shown, and as above stated, are stamped out of comparatively thin sheet steel and into substantially V-shape, the inclined flaring Walls being indicated at 16, 17. The outer edges ofthese flaring or inclined Walls are formedV With notches or depressions 18 therein to form seats to receive the transversely disposed reenforcing rods.

Referring, to Figs. 1 and 2, the planling of the form is indicated at 19,.and in Figs. Sand 4, the poured concrete surrounding and imbedding the rod and chairs is indicated at 20.

In assembling the parts inthe form, the rods are `simply laid into lthe notches .or seats 18ct the cha-irs, the latter resting upon or against the plankin, ,f 19 of the form. t WillV be understood of course thatl eachv rod may befsupported by as many of the chairs as desired.

rEhe form of reenforcing rod or bar is not of consequence. In Fig. 1 I `have shown a plain round steel bar21. In' Fig. '2 a ree enforcingcabl-e section isfshowinand in Figi 3, a grooved bar 23 Ais employed.

In order to Vfacilitate the assembling of the chairs in ,place toreceive the reen-forcing bars, especially in constructing columns or vertical 'Walilhc'lcs indicated at 1 2e, -see Figs.- 4,5, and'ymay be punched through employ reeiiforcing rods disp-lace the crotch or angle portion of the V-shaped or channel chair stamping through which tacks or nails may be driven into the form boards. here this may not be desirable, the chairs may be otherwise positioned, as, for example, by suitably tying them to the rods, by means of cord, Wire, or the like, as indicated at @5, inFig's-11cand 2. For this purpose the inclined side Walls of the stampingrs forming thevchairs may be provided with holes 26, through Which the retaining Wire or cord is passed.

there the chairs resttheir full length against the surface of the form. boards, as indicated at 27, Fig. 4, after the concrete is poured and thefornrboards areremoved the metal of the chairs will be exposed along the line of the exterior surface of tlie. a-pex of the chair. This exposed metal surface While. not objectionablein many cases, and can be easily covered over by the application of a coat of paint still, itkmay sometimes be desirable tol avoid Aundue exposure of the metal of the chairs through the concrete surface. To accomplish this theextreme ends of the apeXrib of thechairs may be expanded outwardly or awayfrom the body of the chair, as indicated at 28Ii`iye's- 8. and 9. The same. result can be secured in other Ways. For example, tcnguesft), see Figs. 1() and 11, slit from the` ends of the chair bodies and bent outwardly away from such bodies. vThese expanded or extended portions, in the one case, or thetongues in the other case,- take the bearing ofthe chairs, against lthe surface of the form boards, thereby reducing to a minimum the extent of exposure of the metal of the chairs through the surface of the concrete When the formboards are removed. In addition, the concrete is also enabled to surround the entire bodies of the chairs exceptfor the small areas of the eXtensionsjQS or ytongues 29, thereby more elfectually anchoring'the chairs in the concrete and enabling'. them to render materia-l aid in the reenforcement of the concrete. The V-shape or channel of the bodies' likewise contribute to thisincreased reenforcing capacity of vthe chairs.

ln practice I prefer toslightly bend or curve the inclined side Walls, oneor both, of the chairs, in the direction ofgthevlengtlh thereof. This nirvaturey is indicated `by the dotted lines 3Q in Figs. 6; and 7 an'd is, required to be onlyv Slight. By reason thereof added strength is secured to resistf'tiie bendingstrain of the Weight of the bar When imposed transversely across @the longitudinally bent sides of the'chair, vvhile atfhe same time a bett-en anchorage of the 'chair in the concrete is falso secured.

Gf course my invention is not vto be' limitedavith respect to number orrela-tion of reenfcicing rods- Itj is Ordina-ry: actice tf iii-,angular rela-tion to each other, the ones crossing the others, depending upon the nature and character oi" the structure to loe huilt. ln Fig. l2, I have shown tivo rods 31, 32, so disposed with relation to each other.

From the foregoing description it will he seen that l provide an exceedingly siinple, strong, economical and efficient reentorcing rod chair device ttor use in reen'forced concrete structures.

Having now set forth the objects and netuie of my invention and various structures embodying the principles thereof, what I claini as new lind useful and of my own invention, and desire to secure Letters Pub ents is:

l. A chair support for the rods or hars oi reeniforced concrete structures comprising a trough sheet metal member of channel shape to form diverging solid Walls, the outer edge of said walls having V-shaped seats to receive and hold the reeni'orcing har.

2. A chair support for the rods or bars ot' reenforced concrete structures comprising a. .metal inemher formed into channel shape, the side Walls of the chair being curved in the direction of their length.

A chair support for the rods or bars of reen'torced concrete structures comprising e sheet metal stamping formed into suhstuir tially V-shape open-ended trough, the Walls of said trough being curved.

lin testimony whereof I have hereunto ,set iny hand on this 3rd day of June A. D., 1920.

HENRY T. OOATES. 

